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Journal of Bacteriology, February 2001, p. 843-853, Vol. 183, No. 3
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.3.843-853.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Identification of a Genomic Island Present in the Majority of Pathogenic Isolates of Pseudomonas aeruginosa

Xiaoyou Liang,1,dagger Xuan-Quynh T. Pham,2 Maynard V. Olson,2 and Stephen Lory1,dagger ,*

Departments of Microbiology1 and Medicine,2 University of Washington Genome Center, University of Washington, Seattle, Washington 98195

Received 8 August 2000/Accepted 10 November 2000

Pseudomonas aeruginosa, a ubiquitous gram-negative bacterium, is capable of colonizing a wide range of environmental niches and can also cause serious infections in humans. In order to understand the genetic makeup of pathogenic P. aeruginosa strains, a method of differential hybridization of arrayed libraries of cloned DNA fragments was developed. An M13 library of DNA from strain X24509, isolated from a patient with a urinary tract infection, was screened using a DNA probe from P. aeruginosa strain PAO1. The genome of PAO1 has been recently sequenced and can be used as a reference for comparisons of genetic organization in different strains. M13 clones that did not react with a DNA probe from PAO1 carried X24509-specific inserts. When a similar array hybridization analysis with DNA probes from different strains was used, a set of M13 clones which carried sequences present in the majority of human P. aeruginosa isolates from a wide range of clinical sources was identified. The inserts of these clones were used to identify cosmids encompassing a contiguous 48.9-kb region of the X24509 chromosome called PAGI-1 (for "P. aeruginosa genomic island 1"). PAGI-1 is incorporated in the X24509 chromosome at a locus that shows a deletion of a 6,729-bp region present in strain PAO1. Survey of the incidence of PAGI-1 revealed that this island is present in 85% of the strains from clinical sources. Approximately half of the PAGI-1-carrying strains show the same deletion as X24509, while the remaining strains contain both the PAGI-1 sequences and the 6,729-bp PAO1 segment. Sequence analysis of PAGI-1 revealed that it contains 51 predicted open reading frames. Several of these genes encoded products with predictable function based on their sequence similarities to known genes, including insertion sequences, determinants of regulatory proteins, a number of dehydrogenase gene homologs, and two for proteins of implicated in detoxification of reactive oxygen species. It is very likely that PAGI-1 was acquired by a large number of P. aeruginosa isolates through horizontal gene transfer. The selection for its maintenance may be the consequence of expression of any one of the genes of unknown function or the genes which allow P. aeruginosa to survive under the conditions that generate reactive oxygen species. Alternatively, one or both of the transcriptional regulators encoded in PAGI-1 may control the expression of genes in the P. aeruginosa chromosome, which provides a selective advantage for strains that have acquired this genomic island.

* Corresponding author. Mailing address: Department of Microbiology and Molecular Genetics, Harvard Medical School, 200 Longwood Ave., Boston, MA 02115. Phone: (617) 432-5099. Fax: (617) 738-7664. E-mail: stephen_lory{at}hms.harvard.edu.

dagger Present address: Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, MA 02115.

Journal of Bacteriology, February 2001, p. 843-853, Vol. 183, No. 3
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.3.843-853.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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